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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96154a9ee8ce56cab332fc5dbda6ce3716d082bc7f72c3346e4638c75471fa83' 
  AND token = 'JK+lGSF4GdyiPc845QS+NSFdSnp6snm3QSh/4lGjFnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}